WorldChanging has an enormous, sprawling interview with three Singularity theorists: James Hughes (whose Citizen Cyborg I've reviewed here), Ramez Naam (author of More Than Human: Embracing the Promise of Biological Enhancement) and Joel Garreau (Radical Evolution: The Promise and Peril of Enhancing Our Minds, Our Bodies — And What It Means To Be Human). They cover a lot of ground here and much of it is very interesting.
When you teach people to read are you making the illiterate less well off? Yes, in fact, in a generally literate society employers will generally want to hire literate people. But we don't then argue that we shouldn't teach people to read because we're making the illiterates worse off. We argue that we should teach everyone to read. So if there is a substantial population of Amish in the future who feel disenfranchised because they've decided not to take the cognitive enhancement drugs, and aren't able to work at what's considered the then normative level of work productivity and cognitive performance, I don't really think that the answer is to have a regulatory approach. I'm not suggesting that that's Joel's answer, but that is a lot of people's answer.
I also don't think that there's any useful distinction between therapy and enhancement although many people will persist in making it. My favorite example is that anti-aging medicine will stop an awful lot of diseases. I don't see how you can distinguish in that case between saying well this is also a prophylactic against cancer, and saying that it will extend my life a couple tens of decades. In terms of the psychopharmaceuticals I'm generally in favor of deregulation. As I said I think that there are gonna be some psychopharmaceuticals and neuro-nano technologies which will have very profound dangers attached to them, much more dangerous than heroin and cocaine are today. But we see with the Drug War today the tremendous social costs associated with restricting people's cognitive liberty.
(Thanks, Andrew!)